In 2008 (the setting of Grand Theft Auto IV), Roman's cousin Niko discovers that she is having an affair with Vladimir Glebov, but only because Vlad promised to settle Roman's debts if she slept with him. Although Niko warns Vlad multiple times to stay away from her, Vlad blows off the threats. Eventually Roman sees Vlad's car parked outside of Mallorie's place and puts two and two together. Roman goes to Niko for support, but when Niko reveals that he had suspicions of the affair, it only makes Roman feel more upset and betrayed. Feeling bad about not informing Roman or doing more to stop the affair, Niko decides that it's time to deal with Vlad once and for all, and the cousins head to the Comrades Bar to put a final end to both Vlad and the affair. Although at the time Roman seems to want a peaceful solution to the problem and calls Niko a "hot headed chump" after he puts a bullet in Vlad's eye; later in the game he tells Mallorie that it was him, not Niko, that killed Vlad in a jealous fit of rage, and that Niko helped him dispose of the body. When Mallorie tells Niko this, he plays along and supports Roman's claim, and tells her that Roman is an "old school romantic".

Later in the game, after Dimitri Rascalov has Roman's taxi depot and apartment destroyed, Mallorie's cousin allows Roman and Niko to stay at their flat in South Bohan. Mallorie introduces Niko to Manny Escuela and Elizabeta Torres. Later, Mallorie calls Niko to tell him that Roman was kidnapped, and Niko manages to rescue him. At the end of the game she marries Roman at a church in Suffolk and reveals that she is pregnant. In the Revenge ending of the game, Roman tells Niko that if they have a daughter, they will name her Kate, after the late Kate McReary (who was gunned down during their wedding by Jimmy Pegorino). During the Deal ending, Mallorie is left a widow (Roman was shot and killed while Niko disarmed an assassin) and tells Niko that the child will struggle without a father. Niko promises that her son "will never have to worry about anything."

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Trivia

In the Broker Safehouse, there is a picture of a much younger looking Mallorie next to the bed, in a picture frame.

It is very likely she has another job besides being at Roman's Cab Depot as she met Michelle there, also during Roman's Sorrow, as soon she meets Roman and Niko in the new safehouse, she's saying she's late for work. This job cannot be Roman's depot since it just got burned.

Although sharing the same surname as Henrique Bardas, it is unlikely that they are related, simply because Mallorie is Puerto Rican and Henrique is of Dominican descent.

Mallorie is known to smoke marijuana. She has a record of the substance, and there is a bong in the South Bohan Safehouse. It is not known if the bong is hers, however, as the apartment belongs to Mallorie's cousin.

After Roman proposes to Mallorie, her voicemail will change, unlike Roman's.

The only mission where she appears outside of a cutscene is Three's a Crowd.

Even though Mallorie cheated on Roman with Vlad, Roman and Niko don't seem to care about the fact she cheated and only blamed Vlad. However, Mallorie later reveals that Vlad promised not to hurt Roman if she slept with him.

Mallorie ends up getting Niko and Roman in trouble a couple of times in the game, despite her good intentions. The first was when she slept with Vlad and Niko killed him, which led to him working for Mikhail Faustin, which ultimately led to Niko being betrayed by Dimitri Rascalov and being hunted by the Russian Mafia. The second was when she got Michelle to date Niko without knowing that she was actually an undercover agent sent to watch Niko. That led to Niko being forced to work for the ULPC. The third time was when she connected Niko to Elizabeta Torres who ended up killing Manny Escuela and getting a 300 year sentence in prison. The only reason Niko wasn't arrested with her is because he was instead forced to work for the ULPC.

Mallorie doesn't show up as an "Unknown Caller" when she first calls Niko. This is likely due to the fact that Niko's cell phone is Roman's old phone.

One of the times that Niko picks up Roman to hang out, Roman will mention that he loves Mallorie, but he has urges and that women keep throwing themselves at him. This could imply that Mallorie and Roman have not yet started having sex, or that Mallorie is withholding sex from Roman, and thus could mean that he is possibly cheating on her.